How To Attach Roof Underlayment Steel Roofing

Make sure the product is designed to be used under metal.

How to attach roof underlayment steel roofing.

On center on both head and end laps. Here are the pros and cons to installing the metal roofing over 1x4 s. Most metal roofs will also require underlayment as well as a slip sheet. In normal wind zones the nails should be driven at 6 0 o c.

Position the roll so that 2 inches of the underlayment are able to hang over outside roof edge decking. Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps. The underlayment also known as roofer s felt is usually asphalt synthetic or polymer based. Some roofers prefer to attach felt underlayment with 1 inch roofing nails or special nails with plastic washers but most codes allow staples which are easier to drive.

Place it on the outside roof edge. Fasten drip edge on eaves with galvanized nails and a hammer about 12 inches. It provides a solid flat surface to attach the new metal roof to. Nail down squarely 90 degrees into the deck to secure caps flush to the underlayment.

Most metal shingles will be attached to the roof using metal shingle. This material separates the roofing from the substrate provides secondary weather protection and guides drainage down the side of the roof. Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails. Before applying roofing you ll need to cover the sheathing with roofing felt also often called tar paper most local codes call for using 30 pound felt.

This type of underlayment is critical to a quality roof installation. Use your hammer and nails to secure the underlayment next to the outside roof edge. Mark a chalk line 35 inches above the roof edge to align the underlayment. We recommend a polypropylene scrim reinforced underlayment made up of multiple layers.

It serves as a moisture barrier as well as a slip sheet. Fasten the field area in the middle of the roll a minimum of 24 o c. Installing the metal roofing over 1x4 s allows the ability to also install additional insulation under the metal roof that can t be done the other two ways.